Page 1 Service Handbook PUHY-400YMF-C, 500YMF-C PUHY-P400YMF-C, P500YMF-C AIR CONDITIONERS CITY MULTI PUHY-600YSMF-C, 650YSMF-C, 700YSMF-C, 750YSMF-C PUHY-P600YSMF-C, P650YSMF-C, P700YSMF-C, P750YSMF-C PUHY-400YMF-C, 500YMF-C Models PUHY-P400YMF-C, P500YMF-C PUHY-600YSMF-C, 650YSMF-C, 700YSMF-C, 750YSMF-C PUHY-P600YSMF-C, P650YSMF-C, P700YSMF-C, P750YSMF-C Service Handbook HEAD OFFICE MITSUBISHI DENKI BLDG. MARUNOUCHI TOKYO 100-0005 TELEX J24532 CABLE MELCO TOKYO New publication effective Jan 2003 Issued in May 2003 MEE02K140 Specifications subject to change without notice.
Page 2: Table Of Contents
Contents 1 PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT ......... 1 [1] Storage of Piping Material ..........2 [2] Piping Machining ............3 [3] Brazing ................4 [4] Airtightness Test ............. 5 [5] Vacuuming ..............5 [6] Charging of Refrigerant ..........6 [7] Dryer ................
Page 3 • Do not reconstruct or change the settings of the protection devices. - If the pressure switch, thermal switch, or other protection device is shorted and operated forcibly, or parts other than those specified by Mitsubishi Electric are used, fire or explosion may result.
Page 4: Precautions For Devices That Use R407C Refrigerant
¡ PRECAUTIONS FOR DEVICES THAT USE R407C REFRIGERANT Caution Do not use the existing refrigerant piping. Use a vacuum pump with a reverse flow check valve. • The vacuum pump oil may flow back into the refriger- • The old refrigerant and refrigerator oil in the existing ant cycle and cause the refrigerator oil to deteriorate.
Page 5: Storage Of Piping Material
[1] Storage of Piping Material (1) Storage location Store the pipes to be used indoors. (Warehouse at site or owner’s warehouse) Storing them outdoors may cause dirt, waste, or water to infiltrate. (2) Pipe sealing before storage Both ends of the pipes should be sealed until immediately before brazing. Wrap elbows and T’s in plastic bags for storage.
Page 6: Piping Machining
[2] Piping Machining Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections. Use only the necessary minimum quantity of oil ! Reason: 1. The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside. Notes: •...
Page 7: Brazing
[3] Brazing No changes from the conventional method, but special care is required so that foreign matter (ie. oxide scale, water, dirt, etc.) does not enter the refrigerant circuit. Example : Inner state of brazed section When non-oxide brazing was not used When non-oxide brazing was used Items to be strictly observed : 1.
Page 8: Airtightness Test
[4] Airtightness Test No changes from the conventional method. Note that a refrigerant leakage detector for R22 cannot detect R407C leakage. Halide torch R22 leakage detector Items to be strictly observed : 1. Pressurize the equipment with nitrogen up to the design pressure and then judge the equipment’s airtightness, taking temperature variations into account.
Page 9: Charging Of Refrigerant
[6] Charging of Refrigerant R407C must be in a liquid state when charging, because it is a non-azeotropic refrigerant. For a cylinder with a syphon attached For a cylinder without a syphon attached Cylin- Cylin- Cylinder color identification R407C-Gray Charged with liquid refrigerant R410A-Pink Valve Valve...
Page 10: Component Of Equipment
[1] Appearance of Components Variable capacity unit Ambient temperature Sensor Heat Exchanger Accumlator Oil Separator Variable Capacity Compressor Constant Capacity Compressor (No. 1 Compressor) (No. 2 Compressor) Oil Equalization Pipe Crank Case Heater Rear Heat Exchanger Four-way Valve (21S4a) Sub-cool Coil Heat Exchanger of CS circuit (PUHY-P-YMF-C only) Four-way Valve...
Page 11 Constant capacity unit Solenoid valve (SV3, PUHN-P-YMF-C only) Solenoid valve (SV2, PUHN-P-YMF-C only) Ambient temperature Sensor Heat exchanger Accumlator Controller box Four-way valve Service check-point (right; high pressure, left; low pressure) Gas ball valve Liquid ball valve Oil balance pipe Constant capacity compressor (No.
Page 12 Controller Box RELAY board FANCON board (for MF3) Choke coil (L2) MAIN board INV board Magnetic contactor (52C2) SNB board Diode stack (DS) FANCON board (for MF2) G/A board Inteligent Power Overload relay Module (IPM) (51C2) Y-C board Magnetic contactor Noise filter Magnetic contactor (52C1) Capacitor (C2, C3)
Page 13 MAIN board CNVCC4 Power source CNTR CNFC1 for control(5V) CNS1 CNS2 CN40 CN41 CNVCC3 Power Source for control CN51 Indication distance Compressor ON/OFF Trouble CNRS3 Serial transmission to INV board CN3D CN3S CN3N Service LED CN20 SWU2 SWU1 Power supply -10-...
Page 14 INV board CNVDC DC-560V CN15V2 Power supply for IPM control CNVCC4 Power supply (5V) CNL2 Choke coil CNVCC2 Power supply 30V, 12V, CN52C CNDR2 Control for Out put to G/A board CNFAN CNTH Control for MF1 CNAC2 Power Source CNRS2 CNACCT Serial transmission to MAIN board...
Page 15 FANCON board CNPOW CNFAN CNFC2 G/A board CNDC1 CN15V1 CNIPM1 CNDR1 -12-...
Page 16 SNB board Y-C board -13-...
Page 17 RELAY board CN51C2 CNOUT2 CNRT2 CN52C2 CNCH CN52F -14-...
Page 18 • Constant capacity unit Controller Box Control board Terminal block TB1 Terminal block TB3 powersource transmission Transformer FANCON board Magnetic contactor (52C) Noise Filter (NF) Thermal overload relay (51C) Thyristor module (SCRM) Fuses (F1, F2) -15-...
Page 19 CONT board CNS1 M-NET transmission SWU2 SWU1 CNFC1 CNTR CN20 Power supply 3 L1 -16-...
Page 20 FANCON board CNFC2 -17-...
Page 21: Refrigerant Circuit Diagram And Thermal Sensor
[2] Refrigerant Circit Diagram and Thermal Sensor PUHY-400, 500YMF-C -18-...
Page 22 PUHY-P400, 500YMF-C -19-...
Page 23 PUHY-600, 650, 700, 750YSMF-C -20-...
Page 24 PUHY-P600, 650, 700, 750YSMF-C -21-...
Page 25: Electrical Wiring Diagram
[3] Electrical Wiring Diagram PUHY-(P)400, 500YMF-C -22-...
Page 26 PUHN-(P)200, 250YMF-C -23-...
Page 27: Standard Operation Data
[4] Standard Operation Data Cooling operation Outdoor unit PUHY-P400YMF-C PUHY-P500YMF-C Items Indoor 27.0/19.0 27.0/19.0 Ambient temp. DB/WB Outdoor 35.0/- 35.0/- Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 27.9 Total current...
Page 28 Outdoor unit PUHY-P600YSMF-C PUHY-P700YSMF-C Variable PUHY-P400YMF-C PUHY-P500YMF-C capacity unit Constant PUHN-P200YMF-C PUHN-P200YMF-C Items capacity unit Indoor 27/19.0 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9 34.9...
Page 29 Outdoor unit PUHY-P650YSMF-C PUHY-P750YSMF-C Variable PUHY-P400YMF-C PUHY-P500YMF-C capacity unit Constant PUHN-P250YMF-C PUHN-P250YMF-C Items capacity unit Indoor 27/19.0 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9 36.9...
Page 30 Outdoor unit PUHY-400YMF-C PUHY-500YMF-C Items Indoor 27.0/19.0 27.0/19.0 Ambient temp. DB/WB Outdoor 35.0/- 35.0/- Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 27.9 27.6/26.2/25.2 33.7/32.0/30.8 Total current 380 ~ 415 380 ~ 415 Voltage...
Page 31 Outdoor unit PUHY-600YSMF-C PUHY-700YSMF-C Variable PUHY-400YMF-C PUHY-500YMF-C capacity unit Constant PUHN-200YMF-C PUHN-200YMF-C Items capacity unit Indoor 27/19.0 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9 34.9...
Page 32 Outdoor unit PUHY-650YSMF-C PUHY-750YSMF-C Variable PUHY-400YMF-C PUHY-500YMF-C capacity unit Constant PUHN-250YMF-C PUHN-250YMF-C Items capacity unit Indoor 27/19.0 DB/WB Ambient temp. Outdoor 35/- Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9 36.9...
Page 33 2 Heating operation Outdoor unit Items PUHY-P400YMF-C PUHY-P500YMF-C Indoor 20.0/- 20.0/- Ambient temp. DB/WB Outdoor 7.0/6.0 7.0/6.0 Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 27.7 Total current 25.6/24.3/23.4 32.1/30.5/29.4...
Page 34 Outdoor unit PUHY-P600YSMF-C PUHY-P700YSMF-C Variable PUHY-P400YMF-C PUHY-P500YMF-C capacity unit Constant PUHN-P200YMF-C PUHN-P200YMF-C Items capacity unit Indoor 20/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9 34.9...
Page 35 Outdoor unit PUHY-P650YSMF-C PUHY-P750YSMF-C Variable PUHY-P400YMF-C PUHY-P500YMF-C capacity unit Constant PUHN-P250YMF-C PUHN-P250YMF-C Items capacity unit Indoor 20/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9 37.9...
Page 36 Outdoor unit Items PUHY-400YMF-C PUHY-500YMF-C Indoor 20.0/- 20.0/- Ambient temp. DB/WB Outdoor 7.0/6.0 7.0/6.0 Quantity Indoor unit Quantity in operation Model Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 22.4 27.7 Total current 25.1/23.9/23.0 31.5/29.9/28.8 Voltage 380 ~ 415...
Page 37 Outdoor unit PUHY-600YSMF-C PUHY-700YSMF-C Variable PUHY-400YMF-C PUHY-500YMF-C capacity unit Constant PUHN-200YMF-C PUHN-200YMF-C Items capacity unit Indoor 20/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 200/200/125/50/25 250/200/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 28.9 34.9...
Page 38 Outdoor unit PUHY-650YSMF-C PUHY-750YSMF-C Variable PUHY-400YMF-C PUHY-500YMF-C capacity unit Constant PUHN-250YMF-C PUHN-250YMF-C Items capacity unit Indoor 20/- DB/WB Ambient temp. Outdoor Quantity Indoor unit Quantity in operation Model 250/200/125/50/25 250/250/125/100/25 Main pipe Piping Branch pipe Total piping length Indoor unit fan notch Refrigerant volume 31.9 36.9...
Page 39: Function Of Dip Sw And Rotary Sw
[5] Function of Dip SW and Rotary SW (1) Outdoor unit PUHY-P600·650·700·750YSMF-C. PUHY-P400·500YMF-C. 1 Variable capacity unit MAIN board Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On SWU 1 ~ 2 Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on.
Page 40 2 Constant Capacity Unit Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On SWU 1 ~ 2 Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on. Ignore liquid level errors Ordinary control Ignore liquid level errors...
Page 41 PUHY-600·650·700·750 YSMF-C. PUHY-400·500YMF-C. 1 Variable Capacity Unit MAIN board Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on. SWU 1 ~ 2 For self diagnosis/ 1 ~ 8...
Page 42 2 Constant Capacity Unit Function According to Switch Operation Switch Set Timing Switch Function When Off When On When Off When On SWU 1 ~ 2 Unit Address Setting Set on 51 ~ 100 with the rotary switch.*2 Before power is turned on. Ordinary control Ignore liquid level errors Ignore liquid level errors...
Page 43 (2) Indoor unit DIP SW1, 3 Operation by SW Switch set timing Remarks Switch SW name Room temp. sensor position Indoor unit inlet Built in remote controller Clogged filter detect. None Provided Filter duration 100h 2500h Always ineffective for PKFY-P.VAM OA intake Ineffective Effective...
Page 44 Setting of DIP SW4 Setting of DIP SW5 Model Circuit board used 220V 240V PMFY-P-VBM-A PLFY-P-VLMD-A – – – – PDFY-P20 ~ 80VM-A PLFY-P40 ~ 63VKM-A PLFY-P80 ~ 125VKM-A Phase control PCFY-P-VGM-A PKFY-P-VGM-A PKFY-P-VAM-A – – – – PEFY-P20 ~ 80VMM-A PFFY-P-VLEM-A, P-VLRM-A –...
Page 45: Test Run
£ TEST RUN [1] Before Test Run (1) Check points before test run There should be neither refrigerant leak nor loose power source or transmission lines. Confirm that the resistance between the power source terminal block and the ground exceeds 2MΩ by measur- ing it with a DC 500 V megger.
Page 46 (3) Check points for test run when mounting options Built-in optional parts Content of test run Check point Result Mounting of drain Release connector of pump circuit, Local remote controller displays code No. check error detection by pouring water “2503”, and the mechanism stops. water lifting-up into drain pan water inlet.
Page 47 (5) Check points for system structure In the case of the PUHY-(P) 400·500 YMF-C Check points from installation work to test run. 1 2 3 4 Classification Portion Check item Trouble Instruction for selecting combination of outdoor unit, and Not operate. Installation indoor unit followed? (Maximum number of indoor units and piping...
Page 48 • • Classification Portion Check item Trouble ¡ Transmission Limitation of transmission line length followed? For Erroneous operation, error stop. line example, 200m or less (total length : 500m) at the farthest. ™ 1.25mm or more transmission line used? Erroneous operation, error stop. (Remote controller 10m or less 0.75mm £...
Page 49 In the case of the PUHY-(P) 600·650·700·750 YSMF-C Check points from installation work to test run. Outdoor unit MAIN board Switch Power source Switch outdoor unit 1 2 3 4 5 Classification Portion Check item Trouble Instruction for selecting combination of outdoor unit, and Not operate.
Page 50 • • Classification Portion Check item Trouble Transmission Limitation of transmission line length followed? For Erroneous operation, error stop. line example, 200 m or less (total length: 500 m) at the farthest. 1.25 mm or more transmission line used? Erroneous operation, error stop. (Remote controller 10 m or less 0.75 mm Error stop in case multiple-core 2-core cable used for transmission line?
Page 51: Test Run Method
[2] Test Run Method Operation procedure Turn on universal power supply at least 12 hours before starting → Displaying “HO” on display panel for about two minutes button twice → Displaying “TEST RUN’’ on display panel Press TEST RUN selection button → Make sure that air is blowing out Press select button to change from cooling to heating operation, and vice versa →...
Page 52: Grouping Registration Of Indoor Units With M-Netremote Controller
¢ GROUPING REGISTRATION OF INDOOR UNITS WITH M-NET REMOTE CONTROLLER (1) Switch function • The switch operation to register with the remote controller is shown below: CENTRALLY CONTROLLED ˚C ON OFF D A I L Y AUTO OFF CLOCK FILTER CHECK REMAINDER CHECK MODE...
Page 53 (2) Attribute display of unit • At the group registration and the confirmation/deletion of registration/connection information, the type (attribute) of the unit is displayed with two English characters. Display Type (Attribute) of unit/controller Indoor unit connectable to remote controller Outdoor unit (PUHY) Outdoor unit (PUHN) Local remote controller System controller (MJ)
Page 54 (3) Group registration of indoor unit Registration method • Group registration of indoor unit ................ 1 The indoor unit to be controlled by a remote controller is registered on the remote controller. [Registration procedure] With the remote controller under stopping or at the display of “HO”, continuously press the switch FILTER ) at the same time for 2 seconds to change to the registration mode.
Page 55 Method of retrieval/confirmation • Retrieval/confirmation of group registration information on indoor unit ....2 The address of the indoor unit being registered on the remote controller is displayed. [Operation procedure] With the remote controller under stopping or at the display of “HO”, continuously press the switch FILTER ) at the same time for 2 seconds to change to the registration mode.
Page 56 • Registered (Alternative display) TEMP ON/OFF CLOCK ON OFF FILTER CHECK TEST PAR-F27MEA TIMER SET (Alternative display) Press the switch for Set the address confirmation ( * Same display will appear when the unit of “007” is not existing. • No registration ˚C ERROR CODE OA UNIT ADDRESS NO...
Page 57 4) Deletion of information on address not existing ∞ • Deletion of information on address not existing ........... This operation is to be conducted when “6607” error (No ACK error) is displayed on the remote controller caused by the miss setting at test run, or due to the old memory remained at the alteration/modification of group composition, and the address not existing will be deleted.
Page 58: Control
∞ CONTROL [1] Control of Outdoor Unit [1]- 1 PUHY-P400·500 YMF-C (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial processing is completed.
Page 59 • The operating temperature is 124˚C (No. 1 compressor) or 115˚C (No. 2 compressor). 4) Compressor frequency control 1 Ordinary control The ordinary control is performed after the following times have passed. • 30 seconds after the start of the compressor or 30 seconds after the completion of defrosting. •...
Page 60 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] Item — At compressor is started ON for 4 minutes — Compressor stopped during cool- ing or heating mode — After operation has been stopped ON for 3 minutes Normally ON During defrosting ((*1) in Fig below) During oil recovery operation...
Page 61 (5) Oil return control (Electronic expansion valve (SLEV)) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor. •...
Page 62 (9) Judgement and control of refrigerant amount • Judge refrigerant amount by detecting refrigerant liquid surface accumulator. 1) Judgement of accumulator liquid level • Return refrigerant from accumulator liquid level detecting circuit to compressor inlet pipe, detect piping tempera- ture, and judge liquid level. When heated with heater, liquid refrigerant temperature is almost equal to low pressure saturation temperature, and gas refrigerant temperature is a little higher than low pressure saturation temperature.
Page 63 (10) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery 1 Refrigerant recovery is started when the two items below are fully satisfied. •...
Page 64 (12) Circulating composition sensor (CS circuit) P-YMF-C only • As shown in the drawing below; the CS circuit has the structure to bypass part of the gas discharged from the compres- sor through the capillary tube to the suction side of the compressor, exchange heat before and after the capillary tube, and produce two phase (gaseous and liquid) refrigerant at the capillary tube outlet.
Page 65 (13) Control at initial starting • When the ambient temperature is low (5˚C or less in cooling and – 5˚C or less in heating), initial starting will be performed if the unit is started within 4 hours of the power being turned on. •...
Page 66 <Initial start control timing chart> End of initial operation mode minutes 30 minutes 10 minutes 5 minutes (Example 1) ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 End of initial operation mode minutes minutes (Example 2)
Page 67 (14) Operation Mode 1) Operating modes of the indoor unit The following five modes can be set by the remote control. Cooling mode Heating mode Dry mode Fan mode Stop mode 2) Operating modes of the outdoor unit The following are the 3 modes for the outdoor unit. Cooling mode All indoor units are operated in cooling mode Heating mode...
Page 68 [1]-2 PUHY-400·500 YMF-C (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control is resumed after initial processing is completed. (Initial processing: Data processing in processing microcomputer and initial setting of each LEV opening, requiring approx.
Page 69 • The operating temperature is 124˚C. 4) Compressor frequency control Ordinary control The ordinary control is performed after the following times have passed. • 30 seconds after the start of the compressor or 30 seconds after the completion of defrosting. •...
Page 70 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] Item — At compressor is started ON for 4 minutes Compressor stopped during cool- — ing or heating mode — After operation has been stopped ON for 3 minutes During defrosting ((*1) in Fig below) Normally ON During oil recovery operation...
Page 71 (5) Oil return control (Electronic expansion valve (SLEV)) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No.
Page 72 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. defrosting has ended, control for changing the number of units is performed. Once •...
Page 73 (10) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery Refrigerant recovery is started when the two items below are fully satisfied. •...
Page 74 (12) Control at initial starting • When the ambient temperature is low (5˚C or less in cooling and – 5˚C or less in heating), initial starting will be performed if the unit is started within 4 hours of the power being turned on. •...
Page 75 <Initial start control timing chart> End of initial operation mode minutes 30 minutes 10 minutes 5 minutes (Example 1) ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 End of initial operation mode minutes minutes (Example 2)
Page 76 (13) Operation Mode 1) Operating modes of the indoor unit The following five modes can be set by the remote control. Cooling mode Heating mode Dry mode Fan mode Stop mode 2) Operating modes of the outdoor unit The following are the 3 modes for the outdoor unit. Cooling mode All indoor units are operated in cooling mode Heating mode...
Page 77 [1]- 3 PUHY-P600·650·700·750 YSMF-C (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial processing is completed. (Initial processing: Data processing in microcomputer and initial setting of each LEV opening, requiring approx.
Page 78 Switching No. 3 compressor from operation to stopping When the required performance is exceeded with the No. 1 and No. 2 variable capacity unit compressors and constant capacity unit No. 3 compressor in operation, the No. 3 compressor will be stopped. 3) Pressure control •...
Page 79 (4) Bypass - capacity control The solenoid valves have bypass valves (SV1, SV4 and SV6) that allow bypassing of the high pressure and low pressure sides and solenoid valves (SV22 and SV32) that control the capacity valve inside the compressor. Those operation are as follows.
Page 80 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] <Variable capacity unit> Item At compressor is started ON for 4 minutes — Compressor stopped during cool- — ing or heating mode After operation has been stopped ON for 3 minutes —...
Page 81 <Constant Capacity Unit> Item At compressor is started ON for 4 minutes — After thermostat reset or 3 ON for 4 minutes — minutes after startup Compressor stopped during ON for 3 minutes — cooling or heating mode After operation has been stopped ON for 3 minutes —...
Page 82 (5) Oil return control (Electronic expansion valve (SLEV); Variable Capacity Unit only) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor. •...
Page 83 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. Once defrosting has ended, control for changing the number of units is performed. •...
Page 84 (10) Liquid Distribution Control (electronic expansion valve (LEV2) constant capacity unit only) • Liquid distribution control refers to the process by which liquid refrigerant returning from the constant and variable capacity units during heating is equally distributed, and the opening of the constant capacity unit LEV2 is so that there is no deficiency of liquid refrigerant in the accumulator of each unit.
Page 85 (11) Liquid Refrigerant Correction Control The liquid refrigerant correction control adjusts the liquid refrigerant amounts between both accumulators in the unlikely event that the liquid refrigerant amount in both the constant and variable capacity unit accumulators should be insufficient, or if excessive amount of liquid refrigerant is returned to either accumulator. During this operation, Service LED No.
Page 86 (12) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery Refrigerant recovery is started when the two items below are fully satisfied. •...
Page 87 (14) Control at initial starting • When the ambient temperature is low (5˚C or less in cooling and – 5˚C or less in heating), initial starting will not be performed even if the unit is started within 4 hours of the power being turned on. •...
Page 88 <Initial Start Control Timingchart> For steps 1 - 3 (Example 1) End of initial operation mode minutes 30 minutes 10 minutes 5 minutes ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 (Example 2) End of initial operation mode minutes minutes...
Page 89 For steps 4 - 6 (Example 1) minutes End of initial operation mode A-minute minutes ON/OFF of (A-minute Definitions) No.1 compressor Operation Conditions Frequency Level (Hz) Constant capacity unit ON/OFF of – power on 7 hours. minute No.2 compressor 217 (For variable capacity unit model 500) 63LS 4.2 K...
Page 90 (Example 4) Less than Less than minutes minutes minutes End of initial operation mode 10 minutes 10 minutes minutes A-minute ON/OFF of No.1 compressor ON/OFF of No.2 compressor Note 3 ON/OFF of Step 4 No.3 compressor Step 6 Note 4 Step 5 Step 6 Step 5...
Page 91 (16) Emergency response operating mode The emergency operation mode is a mode in which the unit is run in an emergency to respond to the trouble when compressors (No. 1, No. 2) break down, making it possible to carry out a trouble reset using the remote control. 1) Starting the Emergency Operation Mode Trouble occurs (Display the trouble code root and trouble code on the remote control).
Page 92 2) Terminating Emergency Response Operation Mode (Termination Conditions) When one of the following conditions is met, emergency operation mode is terminated. Cumulative compressor operation time in the cooling mode exceeds 4 hours. Cumulative compressor operation time in the heating mode exceeds 2 hours. Emergency operation mode trouble detected.
Page 93 [1]-4 PUHY-600·650·700·750 YSMF-C (1) Initial processing • When turning on power source, initial processing of microcomputer is given top priority. • During initial processing, control processing corresponding to operation signal is suspended. The control processing is resumed after initial processing is completed. (Initial processing: Data processing in microcomputer and initial setting of each LEV opening, requiring approx.
Page 94 2 Switching No. 3 compressor from operation to stopping When the required performance is exceeded with the No. 1 and No. 2 variable capacity unit compressors and the constant capacity unit No. 3 compressor in operation, the No. 3 compressor will be stopped. 3) Pressure control •...
Page 95 (4) Bypass - capacity control The solenoid valves have bypass valves (SV1, SV4 and SV6) that allow bypassing of the high pressure and low pressure sides and solenoid valves (SV22 and SV32) that control the capacity valve inside the compressor. Those operation are as follows.
Page 96 2) Bypass solenoid valves (SV1, SV4) [Both SV1 and SV4 are on (open)] <Variable capacity unit> Item At compressor is started ON for 4 minutes — Compressor stopped during cool- — ing or heating mode After operation has been stopped ON for 3 minutes —...
Page 97 <Constant Capacity Unit> Item At compressor is started ON for 4 minutes — After thermostat reset or 3 ON for 4 minutes — minutes after startup Compressor stopped during ON for 3 minutes — cooling or heating mode ON for 3 minutes —...
Page 98 (5) Oil return control (Electronic expansion valve (SLEV); Variable Capacity Unit only) • The amount of opening of the oil-return LEV (SLEV) is determined as follows: in cooling, by the operating capacity of the No. 1 compressor and the ambient temperature; in heating, by the operating capacity of the No. 1 compressor. •...
Page 99 5) Change in number of operating indoor units while defrosting • If the number of indoor units changes while the outdoor unit is defrosting, the defrosting operation continues. Once defrosting has ended, control for changing the number of units is performed. •...
Page 100 (10) Liquid Distribution Control (electronic expansion valve (LEV2) constant capacity unit only) • Liquid distribution control refers to the process by which liquid refrigerant returning from the constant and variable capacity units during heating is equally distributed, and the opening of the constant capacity unit LEV2 is so that there is no deficiency of liquid refrigerant in the accumulator of each unit.
Page 101 (11) Liquid Refrigerant Correction Control The liquid refrigerant correction control adjusts the liquid refrigerant amounts between both accumulators in the unlikely event that the liquid refrigerant amount in both the constant and variable capacity unit accumulators should be insufficient, or if and excessive amount of liquid refrigerant is returned from either accumulator. During this operation, Service LED No.
Page 102 (12) Refrigerant recovery control Refrigerant recovery is conducted to prevent refrigerant from accumulating in the stopped unit (fan unit), the unit under cooling mode and that with heating thermostat being turned off. 1) Start of refrigerant recovery 1 Refrigerant recovery is started when the two items below are fully satisfied. •...
Page 103 (14) Control at initial starting • When the ambient temperature is low (5˚C or less in cooling and – 5˚C or less in heating), initial starting will not be performed even if the unit is started within 4 hours of the power being turned on. •...
Page 104 <Initial Start Control Timingchart> For steps 1 - 3 (Example 1) End of initial operation mode minutes 30 minutes 10 minutes 5 minutes ON/OFF of No.1 compressor Note 1 ON/OFF of No.2 compressor Step 1 Step 2 Step 3 (Example 2) End of initial operation mode minutes minutes...
Page 105 For steps 4 - 6 (Example 1) minutes End of initial operation mode (A-minute Definitions) A-minute minutes ON/OFF of No.1 compressor Operation Conditions Frequency Level (Hz) Constant capacity unit – power on 7 hours. minute ON/OFF of No.2 compressor 217 (For variable capacity [ET or EPT-{(F-22)/22}] unit model 500) 1˚C...
Page 106 (Example 4) Less than Less than minutes minutes minutes End of initial operation mode 10 minutes 10 minutes minutes A-minute ON/OFF of No.1 compressor ON/OFF of No.2 compressor Note 3 ON/OFF of Step 4 No.3 compressor Step 6 Step 5 Step 6 Step 5 Step 4...
Page 107 (16) Emergency response operating mode The emergency operation mode is a mode in which the unit is run in an emergency to respond to the trouble when compressors (No. 1, No. 2) break down, making it possible to carry out a trouble reset using the remote control. 1) Starting the Emergency Operation Mode 1 Trouble occurs (Display the trouble code root and trouble code on the remote control).
Page 108 2) Terminating Emergency Response Operation Mode (Termination Conditions) When one of the following conditions is met, emergency operation mode is terminated. Cumulative compressor operation time in the cooling mode exceeds 4 hours. Cumulative compressor operation time in the heating mode exceeds 2 hours. Emergency operation mode trouble detected.
Page 109: Operation Flow Chart
[2] Operation Flow Chart (1) Outdoor unit (Cooling, heating modes) Start Normal operations Breaker turned on Trouble observed Stop “HO” blinks on the remote control- Note: 1 Set indoor address No. to remote controller Operation command Oil return LEV, SC coil LEV fully closed Operation mode...
Page 110 (2) Indoor unit (Cooling, heating, dry, and fan modes) Start Normal operations Trouble observed Breaker turned on Stop Operation SW turned on Note: 1 1. Protection function self-holding cancelled. 2. Indoor unit LEV full closed. Note: 2 Remove controller display extinguished Error mode Operation mode Error stop...
Page 111 (3) Cooling operation Cooling operation Normal operations 4-way valve OFF Test run Stop Note: 1 Indoor unit fan operations Test run start Thermostat ON 3-minute restart pre- vention Variable capacity unit Variable capacity unit 1. Inverter output 0 Hz 1. Inverter frequency level control 2.
Page 112 (4) Heating operation Normal operations Heating operation Defrosting operations Note: 1 Stop Test run Defrosting operation During constant 4-way valve ON capacity unit operation or Operation over 30 minutes before stopping the constant capacity unit. Test run start Variable capacity unit 4-way valve OFF Variable capacity unit 4-way valve OFF Constant capacity unit 4-way valve ON Constant capacity unit 4-way valve ON...
Page 113 (5) Dry operation Dry operations Normal operations Thermostat ON 4-way valve OFF Stop Test run start Note: 2 Thermostat ON Inlet temp. 18˚C Note: 1 Variable capacity unit 1. Outdoor unit (Compressor) intermit- 1. Inverter output 0 Hz tent operations 2.
Page 114: List Of Major Component Functions
[3] List of Major Component Functions Code Name Product code Application Specification Inspection method (Function) 1 Adjustment of super heat of heat Electronic DC 12 V Perform a continuity check using a tester. expansion exchanger outlet port of indoor unit Amount of opening of the Conductivity among valve...
Page 115 Code Name Product code Application Specification Inspection method (Function) Thermistor = 15 kΩ Resistance check Detects liquid level of refrigerant inside = 3460 accumulator using the differences 1/80 (Liquid level Rt = among TH2, TH3, TH4. detection) 15exp{3460( 273+t 1 Frequency control. 0°C: 15 kΩ...
Page 116 Code Name Product code Application Specification Inspection method (Function) Solenoid Controls heat exchanger capacity of AC 220 to 240 V Conductivity test SV5b heat vallve exchanger outdoor unit. Close: conducting using tester capacity Open : not conducting control Evaporation of liquid refrigerant inside AC 220 to 240 V MC2.
Page 117 Code Name Product code Application Specification Inspection method (Function) Thermistor Detects the outdoor air temperature. = 15 kΩ Resistance check (Outdoor Performs fan control, liquid level = 3460 0/80 temperature) control, and oil-return LEV opening settings. 15exp{3460( 273+t Controls LEV1 using temperature 0°C: 15 kΩ...
Page 118: Resistance Of Temperature Sensor
[4] Resistance of Temperature Sensor Thermistor for low temperature = 15kΩ ± 3% (TH3 ~ 9a,9b,10a,10b) = 7.465kΩ ± 2% (TH11,12,10c) Thermistor R Thermistor R = 15exp {3460 ( = 7.465exp {4057 ( 273+t 273+120 273+t 273+0 –20 –10 Temperature (˚C) Temperature (˚C) = 33kΩ...
Page 119: Refrigerant Amount Adjustment
§ REFRIGERANT AMOUNT ADJUSTMENT By clarifying the relationship between the refrigerant amount and operating characterstics, conduct service activities such as decision on the amount and adjustment of refrigerant on the market. [1] Operating Characteristics and Refrigerant Amount The followings are operating characteristics and refrigerant amount which draw special attention. During cooling operations, required refrigerant amount tends to increase (refrigerant in accumulator decreases) in proportion to increase in the number of operating indoor units.
Page 120 (2) Refrigerant Volume 1) Checking the Operating Condition Operate all the indoor units in cooling or in heating, checking the discharge temperature, sub-cooling, low pressure saturation temperature, inlet temperature, shell bottom temperature, fluid level, fluid step, etc. and render an overall judgment.
Page 121 Example PUHY-P600YSMF-C ø15.88 (10 m) ø12.7 (10 m) ø12.7 (20 m) ø12.7 ø15.88 ø12.7 (3 m) (1 m) (10 m) ø9.52 ø9.52 ø9.52 ø6.35 ø9.52 (20 m) (10 m) (10 m) ø9.52 ø9.52 (10 m) (10 m) ø19.05 (10 m) (10 m) (30 m) Model...
Page 122: Refrigerant Volume Adjustment Mode Operation
[3] Refrigerant Volume Adjustment Mode Operation (1) Procedure Depending on the operating conditions, it may be necessary either to charge with supplementary refrigerant, or to drain out some, but if such a case arises, please follow the procedure given below. Switching the function select switch (SW2-4), located on the outdoor unit’s control board, ON starts refrigerant volume adjustment mode operation and the following operation occurs.
Page 123 (2) Refrigerant adjustment in cooling season (Flow chart) PUHY-(P) 400·500 YMF-C Start adjustment Set all indoor units to test run mode and start cooling. Is the liquid level Use the low-pressure service of the accumulator 0 or 1, port to drain out refrigerant 6 minutes or more after a little at a time.
Page 124 PUHY-(P) 600·650·700·750 YSMF-C Start adjustment AL1: Variable capacity unit liquid level AL AL2: Constant capacity unit liquid level AL All indoor units begin cooling operations in Note: 3 test run mode. Both constant and variable capacity units are operated. Over 6 minutes have Use the low-pressure service passed since variable and port of AL ≠...
Page 125 (3) Refrigerant adjustment in heating season (Flow chart) PUHY-(P) 400·500 YMF-C Start Adjustment Run all the indoor units in the heating condition in the test run mode. Note: 1 AL = 1 or 2 Note: 2 Note: 3 Is the AL = 2 Has the operating accumulator's liquid level...
Page 126 PUHY-(P) 600·650·700·750 YSMF-C -123-...
Page 127 Note: 1 If there are any units which are not operating, it will cause refrigerant to accumulate, so operate all the indoor units. Also, in order to prevent stable operation from being disrupted by the thermostat going OFF, set the trial operation mode.
Page 128: Troubleshooting
¶ TROUBLESHOOTING [1] Principal Parts Pressure Sensor (1) Judging Failure 1) Check for failure by comparing the sensing pressure according to the high pressure/low pressure pressure sensor and the pressure gauge pressure. Turn on switches 1, 3, 5, 6 (High) and 2, 4, 5, 6 (Low) of the digital display select switch (SW1) as shown below, and the sensor pressure of the high pressure/low pressure sensors is displayed digitally by the light emitting diode LD1.
Page 129 Solenoid Valve Variable Capacity Unit Valves (SV1, SV22, SV32, SV4, 21S4a, 21S4b, SV5b, SV6, SV7, SV8) Check if the control board’s output signals and the operation of the solenoid valves match. Setting the self-diagnosis switch (SW1) as shown in the figure below causes the ON signal of each relay to be output to the LED’s.
Page 130 6) SV6 When No. 2 compressor is operating and No. 2 compressor is stopped, the main SV6 will be set to ON, making it possible to confirm operation by monitoring the LED display and listening to the operating sound. Note that it may be set to OFF if the outlet temperature (TH11) exceeds 120°C .
Page 131 2) SV2, 3 (Full-load / Un-load switching valve) PUHN-P-YMF-C only It starts in un-load in the initial start mode and during defrosting, and starts in full-load at all other times. It is possible to determine whether or not the compressors are switching from unload to full load by check the changes in amperage of the compressor at the moment of switching.
Page 132 Outdoor LEV The valve percentage opening changes in proportion to the number of pulses. (Connections between the outdoor unit’s MAIN board and SLEV, (LEV1, LEV2)) 1 SLEV, LEV1 Pulse Signal Output and Valve Operation Output pulses change in the following orders when the Output states Output (phase) Valve is Closed...
Page 133 LEV2 Pulse Signal Output and Valve Operation Output (Phase) Output State Output pulses change in the following orders when the ø1 OFF OFF ON 1 → 2 → 3 → 4 → 1 ON OFF OFF ø2 Valve is Closed ON OFF ø3 4 →...
Page 134 Judgment methods and likely failure mode Caution: The specifications of the outdoor unit (outdoor LEV) and indoor unit (indoor LEV) differ. For this reason, there are cases where the treatment contents differ, so follow the treatment specified for the appropriate LEV as indicated in the right column.
Page 135 Outdoor LEV (SLEV) Coil Removal Procedure (configuration) As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. Body Coils Stopper Indentation for Stopper (12 places around the circumference) Lead Wires <Removing the Coils>...
Page 136 Intelligent Power Module (IPM) Measure resistances between each terminal of IPM with tester, and use the results for troubleshooting. Specified resistance value is dependent on tester type to be used for resistance measurement, because diode inside IPM has non-linearity, thus difference of impedance and voltage in tester being influential. As the internal impedance of resistance range of analog tester equals to the center value of meter indication, the affect of internal impedance can be minimized if the tester having close center value of resistance range.
Page 137 (2) Trouble and remedy of remote controller (In the case of MA remote controller) Phenomena Factors Check method and handling If pushing the remote 1) Power supply from transformers is not turned on in a) Check the MA remote control terminal control operation SW Indoor Unit.
Page 138 Phenomena Factors “HO” indication on 1) The M-NET transmission power supply form the the remote controller outdoor unit is not supplied. is not lit, and the The original power supply of Indoor Unit is not ON/OFF switch does turned on. not work.
Page 139 (In the case of M-NET remote controller) Symptom Cause Checking method & countermeasure Despite pressing of 1) M-NET transmission power source is not supplied a) Check transmission terminal block of remote controller from outdoor unit. remote controller for voltage. ON/OFF switch, Main power source of outdoor unit is not i) In case of 17 ~ 30V operation does not...
Page 140 Symptom Cause “HO” display on re- (Without using MELANS) mote controller does 1) Outdoor unit address is set to “00” not disappear and 2) Erroneous address. ON/OFF switch is 1 Address setting of indoor unit to be coupled with remote controller incorrect. ineffective.
Page 141 Symptom Cause Checking method & countermeasure “88” appears on re- [Generates at registration and confirmation] a) Confirm the address of unit to be mote controller at 1) Erroneous address of unit to be coupled. coupled. registration and b) Check the connection of transmission 2) Disconnection of transmission line of unit to be access remote coupled (No connection).
Page 142 Transmission Power Circuit (30 V) Check Procedure If “ ” is not displayed by the remote control, investigate the points of the trouble by the following procedure and correct it. Check Item Judgment Response Disconnect the transmission line from TB3 DC24~30 V Check the transmission line for the following, and and check the TB3 voltage.
Page 143 (3) Investigation of transmission wave shape/noise Control is performed by exchanging signals between outdoor unit, indoor unit and remote controller by M-NET transmission. If noise should enter into the transmission line, the normal transmission will be hindered causing erroneous operation. 1) Symptom caused by the noise entered into transmission line Cause Erroneous operation...
Page 144 3) Checking and measures to be taken (a) Measures against noise Check the items below when noise can be confirmed on wave shape or the error code in the item 1) is generated. Items to be checked Measures to be taken Wiring of transmission and power lines in Isolate transmission line from power line (5cm or more).
Page 145 4) Treatment of Inverter and Compressor Troubles If the compressor does not work when error codes 4240, 4250, 4340 or 4350 are detected, determine the point of malfunction by following the steps in the LED monitor display and countermeasures depending on the check code displayed, then perform the procedures below.
Page 146 5) Treatment of Fan Motor Related Troubles Condition Possible Cause Check Method and Treatment The fan motor will not run 1) The power supply voltage If there is an open phase condition before the breaker, after for 20 minutes or longer is abnormal.
Page 147 6) Troubleshooting at breaker tripping Check items Measures to be taken The breaker’s capacity should be correct to “System Check the breaker capacity. design” in data book. Check for a short circuit or grounding in the electrical Correct any defects. system other than the inverter.
Page 148 Individual Parts Failure Judgment Methods. Part Name Judgment Method Diode Stack (DS) Refer to “Judging Diode Stack Failure.” Intelligent Power Module(IPM) Refer to “Judging IPM Failure.” Electromagnetic Contactor (52C) Measure the resistance value at each terminal. 1/L1 3/L2 5/L3 Check Location Judgment Value A1-A2 0.1k~1.3k 1/L1-2/T1...
Page 149 Motor (Compressor) White Black Black Capacitor (C2,C3) G/A board -146-...
Page 150 8) Compressor Replacement Procedure When replacing a compressor, please proceed by the following procedure. • When replacing the No. 1 compressor (variable capacity compressor), begin the replacement work after judging whether the trouble is a compressor breakdown or an inverter breakdown. If only one of the compressors is defec- tive, run the unit for about 1 hour in the emergency operation mode, checking the following items and judging if the oil return circuit is defective or not before replacing the compressor.
Page 151 (13) Solder the discharge piping, suction piping, volume control valve piping (All but model PUHY-(P)400YMF-C) and process piping (All but model PUHY-(P)400YMF-C). (14) Attach the oil equalization pipe to both compressors. In the case of the PUHY-P-YMF-C, replace the dryer with a new one.
Page 152 Constant Capacity Unit Observe the following notes when changing the compressor (1) Make sure the main power supply is turned off. If the reason for the compressor replacement is faulty insulation resistance, if the insulation resistance (Mega- check) is 1 M or greater, it is possible that it has dropped due to the dormancy of the refrigerant to the compres- sor, so after turning on the power for 12 hours with a belt heater heating, turn off the power and check the insulation resistance again.
Page 153 Check Code List Check Code Check Content 0403 Serial transmission abnormality 0900 Trial operation 1102 Discharge temperature abnormality 1111 Low pressure saturation temperature sensor abnormality (TH2) 1112 Low pressure saturation Liquid level sensing temperature sensor abnormality (TH4) 1113 temperature abnormality Liquid level sensing temperature sensor abnormality (TH3) 1301 Low pressure abnormality (OC) 1302...
Page 154 Check Code Check Content 6606 Communications with transmission processor abnormality 6607 No ACK abnormality 6608 No response abnormality 6831 MA communication, No-reception error 6832 MA communication, Synchronization recovery error 6833 MA communication, Transmission/reception handware error 6834 MA communication, Start bit error 7100 Total capacity abnormality 7101...
Page 155: Self-Diagnosis And Countermeasures Depending On The Check Code Displayed
[2] Self-diagnosis and Countermeasures Depending on the Check Code Displayed (1) Mechanical Checking code Meaning, detecting method Cause Checking method & Countermeasure 0403 Serial If serial transmission cannot be 1) Wiring is defective. Check 1, the connections, 2, contact transmission established between the MAIN and at the connectors and 3, for broken abnormality...
Page 156 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1111 1. When saturation temperature 1) Gas leak, Gas shortage. See Refrigerant amount check. pressure sensor (TH2) or liquid level de- saturation tecting temperature sensors 2) Insufficient load operations. Check operating conditions and tempera- (TH3, TH4) detects -40˚C or operation status of outdoor unit.
Page 157 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1301 Low pressure When starting from the stop mode 1) Internal pressure is dropping due Refer to the item on judging low pres- abnoramlity for the first time, (if at the start of bind to a gas leak.
Page 158 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1302 High pressure When press. sensor detects 1) Fall in internal press. caused by See Trouble check of pressure sen- abnoramlity 2 0.098MPa or less just before gas leak. sor. (Outdoor unit) starting of operation, erro stop is 2) Press.
Page 159 Checking code Meaning, detecting method Cause Checking method & Countermeasure 1505 Suction • R22 refrigerant models: • Operation due to accidental failure to If there has been suction pressure er- 1 If it has been determined by pressure open the ball valve, especially the ball ror, do not restart operation by reset- abnormality the high pressure pressure,...
Page 160 Checking code Meaning, detecting method Cause Checking method & Countermeasure 2500 Leakage (water) 1) Water leak due to humidifier or the Check water leaking of humidifier When drain sensor detects flood- abnormality like in trouble. and clogging of drain pan. ing during drain pump OFF.
Page 161 Checking code Meaning, detecting method Cause Checking method & Countermeasure 4106 Power off 1 Cannot operate because the 1) Power cord problem Measure the voltage in each part of abnormality constant capacity unit is dis- (constant capacity unit is discon- the constant capacity unit (Variable connected from the power...
Page 162 Checking code Meaning, detecting method Cause Checking method & Countermeasure 4200 VDC 1 If VDC 304 V is detected just 1) Power supply voltage is abnor- • Check if an instantaneous power sensor/circuit before the inverter starts. mal. failure or power failure, etc. has abnormality 2 If VDC 750 V is detected just...
Page 163 Checking code Cause Checking method & Countermeasure Meaning, detecting method 4220 1 If VDC 400 V is de- 1) The power supply voltage • Check if an instantaneous stop or power failure, etc. voltage tected during inverter is abnormal. has occurred. abnormality operation.
Page 164 Checking code Meaning, detecting method Cause Checking method & Countermeasure 4240 Over load If IAC 32 Amps is detected con- 1) Air passage short cycle. Is the unit’s exhaust short cycling? protection tinuously for 10 minutes during op- eration of the inverter after 5 or 2) The heat exchanger is clogged.
Page 165 Checking code Meaning, detecting method Cause Checking method & Countermeasure 5101 Discharge 1 Detects thermistor short (high 1) Defective thermistor. Check thermistor resistance. (TH11) temperature pick up) during (TH12) operation or open circuit (low 2) Tangled lead wires. Check for tangled lead wires. temperature pick up).
Page 166 Checking code Meaning, detecting method Cause Checking method & Countermeasure 5201 Pressure When pressue sensor detects Pressure sensor trouble. See Troubleshooting of pressure sensor 0.098MPa or less during sensor. abnormality operation, outdoor unit once (Variable stops with 3 minutes restarting 2) Inner pressure drop due to a leak- mode, and restarts if the detected age.
Page 167 Checking code Meaning, detecting method Cause Checking method & Countermeasure 5301 IAC sensor/ If IAC Amps is detected just 6) The circuit board is defective. If none of the items in 1) to 5) is appli- circuit before the inverter starts, or cable, and if the trouble reappears abnormality If IAC...
Page 168 (2) Communication/system Checking Meaning, detecting method Cause Checking method & Countermeasure code 1) Two or more controllers of outdoor At the genration of 6600 error, release the error by 6600 Multiple address error unit, indoor unit, remote controller, remote controller (with stop key) and start again. BC controller, etc.
Page 169 Checking Meaning, detecting method Cause Checking method & Countermeasure code Transmission processor hardware Checking method and processing 6602 error Transmission line Shut off the power source of outdoor/in- installed while turning door units and make it again. power source on? Check power source of indoor unit.
Page 170 Checking Meaning, detecting method Cause Checking method & Countermeasure code 6606 Communications with transmis- 1) Data is not properly transmitted due Turn off power sources of indoor unit, and outdoor sion processor error to casual errouneous operation of unit. the generating controller. When power sources are turned off sepa- Communication trouble between 2) Faulty generating controller.
Page 171 Checking Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second interval by transmission side controller, the transmission side detects error. Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
Page 172 Checking Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second (continued) interval by transmission side controller, the transmission side detects error. Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
Page 173 Checking Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second (continued) interval by transmission side controller, the transmission side detects error. Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
Page 174 Checking Meaning, detecting method code 6607 No ACK error When no ACK signal is detected in 6 continuous times with 30 second (continued) interval by transmission side controller, the transmission side detects error. Note: The address/attribute shown on remote controller indicates the controller not providing the answer (ACK).
Page 175 Checking Meaning, detecting method Cause Checking method & Countermeasure code 6608 No response error 1) At the collision of mutual transmis- a) Generation at test run. sion data when transmission wiring Turn off the power sources of OC unit and IC Though acknowledgement of re- is modified or the polarity is unit for more than 5 minutes simultaneously,...
Page 176 (3) System error Checking Meaning, detecting method Cause Checking method & Countermeasure code 7100 Total capacity error 1) Total capacity of indoor units in the a) Check for the model total (capacity cord total) of same refrigerant system exceeds indoor units connected. Total capacity of indoor units in the following: b) Check whether indoor unit capacity code (SW2)
Page 177 Checking Meaning, detecting method Cause Checking method & Countermeasure code 7102 Connected unit count over 2) Disconnection of transmission d) Check for the model total (capacity code total) of indoor units connected. wiring at Outdoor unit. 3) Short circuit of transmission line in case of 2) and 3), remote controller displays “HO”.
Page 178 (4) The following events are not malfunctions (errors). Event Remote controller display Cause The indoor unit does not operate “Cooler (heater)” blinks The cooling or heating system will not operate when the even when the cooling or heating system is operating in the opposite mode for another system has been turned on.
Page 179 Event Remote controller display Cause The four-way solenoid of the con- Normal display In order to prevent intrusion of the refrigerant while the stant rate unit turns on during constant rate unit is shut down, the four-way solenoid of cooling system operation. the constant rate unit is on during cooling, off during heat- ing, and off during shut down.
Page 180: Led Monitor Display
[3] LED Monitor Display (1) How to read LED for service monitor By setting of DIP SW1-1 ~ 1-8, the unit operating condition can be observed with the service LED on the control circuit board. (For the relation of each DIP SW to the content, see the table provided.) As shown in the figure below, the LED consist of 7 segments is put in 4 sets side by side for numerical and graphic display.
Page 181 1 Variable capacity unit (SW4-2 OFF) Item Display Remarks 12345678910 0000000000 Relay Output COMP COMP1 52C2 21S4a SV 22/ Lights for LD8 is a relay output Display 1 (Light up Operating Operating Normal indicator which lights Operation up at all times when to display) the microcomputer’s Check Display 1...
Page 182 Variable capacity unit Item Display Remarks 12345678910 1010100000 Outdoor Unit High — No. 1. No. 2 No. 1 No. 2 Heat Sink Lights up if an error Preliminary Error Pressure Pressure Discharge Discharge Over- Over- Thermo- delay has occurred History Error 1, 2 Error Tempera-...
Page 183 Variable capacity unit Item Display Remarks 12345678910 0010110000 TH6 Data – 99.9 ~ 999.9 1010110000 TH7 Data 0110110000 TH8 Data 1110110000 TH9a Data 0001110000 TH9b Data 1001110000 TH10c Data 0101110000 High Pressure Sensor Data 1101110000 Low Pressure Sensor Data 0011110000 THHS Data 1011110000 0111110000...
Page 184 When there is an error stop with No101-125, the data on error stops or the data immediately before the error postponement stop, which is stored in service memory, are displayed. Variable capacity unit Item Display Remarks 12345678910 0110101000 IC6 Address/ 0000 ~ 9999 Displayed alternately Capacity Code...
Page 185 When there is an error stop with No101-125, the data on error stops or the data immediately before the error postponement stop, which is stored in service memory, are displayed. Variable capacity unit Item Display Remarks 12345678910 0010111000 0 ~ 9.999 1010111000 0110111000 0000 ~ 9999...
Page 186 Variable capacity unit Item Display Remarks 12345678910 0111000100 IC15 Room – 99.9 ~ 999.9 Temperature 1111000100 IC16 Room Temperature 0000100100 IC1 Liquid Pipe Temperature 1000100100 IC2 Liquid Pipe Temperature 0100100100 IC3 Liquid Pipe Temperature 1100100100 IC4 Liquid Pipe Temperature 0010100100 IC5 Liquid Pipe Temperature 1010100100...
Page 187 Variable capacity unit Item Display Remarks 12345678910 0011010100 IC13 Gas Pipe Temperature – 99.9 ~ 999.9 1011010100 IC14 Gas Pipe Temperature 0111010100 IC15 Gas Pipe Temperature 1111010100 IC16 Gas Pipe Temperature 0000110100 IC1 SH 1000110100 IC2 SH 0100110100 IC3 SH 1100110100 IC4 SH 0010110100...
Page 188 Variable capacity unit Item Display Remarks 12345678910 0000101100 IC1 LEV Opening 0000 ~ 9999 Pulse 1000101100 IC2 LEV Opening Pulse 0100101100 IC3 LEV Opening Pulse 1100101100 IC4 LEV Opening Pulse 0010101100 IC5 LEV Opening Pulse 10101011000 IC6 LEV Opening Pulse 0110101100 IC7 LEV Opening Pulse...
Page 189 Variable capacity unit Item Display Remarks 12345678910 1101011100 IC12 Operation 0: Stop Mode 1: Fan 2: Cooling 0011011100 IC13 Operation 3: Heating Mode 4: Dry 1011011100 IC14 Operation Mode 0111011100 IC15 Operation Mode 1111011100 IC16 Operation Mode 0000 ~ 9999 0000111100 IC1 Filter 1000111100...
Page 190 Variable capacity unit Item Display Remarks 12345678910 0111000010 1111000010 0000100010 1000100010 0100100010 1100100010 0010100010 1010100010 0110100010 1110100010 0001100010 1001100010 0101100010 1101100010 0011100010 1011100010 0111100010 1111100010 0000010010 1000010010 0100010010 1100010010 0010010010 1010010010 0110010010 1110010010 0001010010 1001010010 0101010010 1101010010 0011010010 1011010010 0111010010 1111010010 0000110010 1000110010...
Page 191 Variable capacity unit Item Display Remarks 12345678910 1010110010 0110110010 1110110010 0001110010 1001110010 0101110010 1101110010 0011110010 1011110010 0111110010 1111110010 0000001010 1000001010 0100001010 1100001010 0010001010 1010001010 0110001010 1110001010 0001001010 1001001010 0101001010 1101001010 0011001010 1011001010 0111001010 1111001010 0000101010 IC17 Address/ Displayed alternately 1000101010 0000 ~ 9999 Capacity Code every 5 seconds.
Page 192 Variable capacity unit Item Display Remarks 12345678910 1001101010 IC25 Address/ 0000 ~ 9999 Capacity Code 0101101010 IC26 Address/ Capacity Code 1101101010 IC27 Address/ Capacity Code 0011101010 IC28 Address/ Capacity Code 1011101010 IC29 Address/ Capacity Code 0111101010 IC30 Address/ Capacity Code 1111101010 IC31 Address/ Capacity Code...
Page 193 Variable capacity unit Item Display Remarks 12345678910 1011111010 0111111010 1111111010 0000000110 IC17 Room – 99.9 ~ 999.9 Temperature 1000000110 IC18 Room Temperature 0100000110 IC19 Room Temperature 1100000110 IC20 Room Temperature 0010000110 IC21 Room Temperature 1010000110 IC22 Room Temperature 0110000110 IC23 Room Temperature 1110000110 IC24 Room...
Page 194 Variable capacity unit Item Display Remarks 12345678910 0001100110 IC25 Liquid Pipe Temperature 1001100110 IC26 Liquid Pipe Temperature 0101100110 IC27 Liquid Pipe Temperature 1101100110 IC28 Liquid Pipe Temperature 0011100110 IC29 Liquid Pipe Temperature 1011100110 IC30 Liquid Pipe Temperature 0111100110 IC31 Liquid Pipe Temperature 1111100110 IC32 Liquid Pipe...
Page 195 Variable capacity unit Item Display Remarks 12345678910 0100110110 IC19 SH 1100110110 IC20 SH 0010110110 IC21 SH 1010110110 IC22 SH 0110110110 IC23 SH 1110110110 IC24 SH 0001110110 IC25 SH 1001110110 IC26 SH 0101110110 IC27 SH 1101110110 IC28 SH 0011110110 IC29 SH 1011110110 IC30 SH 0111110110...
Page 196 Variable capacity unit Item Display Remarks 12345678910 0110101110 IC23 LEV Opening Pulse 1110101110 IC24 LEV Opening Pulse 0001101110 IC25 LEV Opening Pulse 1001101110 IC26 LEV Opening Pulse 0101101110 IC27 LEV Opening Pulse 1101101110 IC28 LEV Opening Pulse 0011101110 IC29 LEV Opening Pulse 1011101110 IC30 LEV...
Page 197 Variable capacity unit Item Display Remarks 12345678910 0000 ~ 9999 0000111110 IC17 Filter 1000111110 IC18 Filter 0100111110 IC19 Filter 1100111110 IC20 Filter 0010111110 IC21 Filter 1010111110 IC22 Filter 0110111110 IC23 Filter 1110111110 IC24 Filter 0001111110 IC25 Filter 1001111110 IC26 Filter 0101111110 IC27 Filter 1101111110...
Page 198 Constant capacity unit (SW4-2 ON) Item Display Remarks 12345678910 SV2, 3 0000000000 Relay Output COMP COMP 1 21S4a Lights for LD8 is a relay output Only for Display 1 (blinking Opera- Operat- Normal indicator which lights display) tion Operation up at all times when PUHN- the microcomputer’s P-YMF-C...
Page 199 Constant capacity unit Item Display Remarks 12345678910 1001100000 0101100000 1101100000 0011100000 1011100000 0111100000 1111100000 0000010000 1000010000 0100010000 1100010000 0010010000 1010010000 0110010000 1110010000 0001010000 1001010000 0101010000 1101010000 0011010000 1011010000 0111010000 TH11 Data – 99.9 ~ 999.9 1111010000 0000110000 1000110000 TH3 Data –...
Page 200 Constant capacity unit Item Display Remarks 12345678190 0000001000 Accumulator level 0 ~ 9 (“AL =” is also displayed) 1000001000 TH10a – 99.9 ~ 999.9 0100001000 TH10b 1100001000 0010001000 1010001000 0110001000 1110001000 0001001000 1001001000 0101001000 0000 ~ 9999 1101001000 LEV2 0011001000 LEV1 1011001000 FANCON Output...
Page 201 When there is an error stop with No101-125, the data saved in the service memory immediately before the error is displayed. Constant capacity unit Item Display Remarks 12345678910 1010011000 Relay Output COMP 52C1 21S4 Light for Display 1 (blinking Opera- Normal display) tion...
Page 202: Preparation, Repairs And Refrigerant Refilling When Repairing Leaks
• PREPARATION, REPAIRS AND REFRIGERANT REFILLING WHEN REPAIRING LEAKS [1] Location of leaks: Extension piping or indoor units (when cooling) (Pump down operation) 1 Attach a pressure gage to the low-pressure servicing check joint (CJ2). 2 Stop all of the indoor units. When the compressor has stopped, shut off the liquid ball valve (BV2) for the outdoor unit.
Page 203: Location Of Leaks: Outdoor Unit (Cooling Mode)
[2] Location of leaks: Outdoor unit (Cooling mode) Test run all indoor units in cooling mode. 1. With SW3-1 on the MAIN board of the outdoor unit set to ON and SW3-2 OFF ON to test run all indoor units. 2.
Page 204: Location Of Leaks: Outdoor Unit (When Heating)
[4] Location of leaks: Outdoor unit (when heating) Remove any refrigerant from the entire system (outdoor unit, extension piping and indoor units). Reclaim the refrigerant; do not discharge it into the air. Repair the leaks. After the leaks are repaired, replace the dryer with a new one and extract all of the air from the entire system to create a vacuum.
Page 205: Check The Composition Of The Refrigerant
ª CHECK THE COMPOSITION OF THE REFRIGERANT Start Test run all indoor units. Are all units operating stably? (Note 1) Is the refrigerant composition of OC correct? (Note 2) Check TH2, TH9, LPS and the CS Finished checking the circuit block and correct any malfunc- composition.
Page 206 Note 1 Wait until the units stabilize as described in the refrigerant amount adjustment procedure in “Chapter 6 ”. Note 2 After the units are operating stably, check that the refrigerant composition of OC is within the following ranges, indicating that the composition check is finished. If the accumulator liquid level AL = 0 when cooling: OC = 0.20 ~ 0.26 If the accumulator liquid level AL = 1 when cooling:...

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Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook

1 Precautions for Devices that Use R407C Refrigerant

2 Component of Equipment

3 Test Run

4 Grouping Registration of Indoor Units with M-Netremote Controller

5 Control

6 Refrigerant Amount Adjustment

7 Troubleshooting

8 Preparation, Repairs and Refrigerant Refilling When Repairing Leaks

9 Check the Composition of the Refrigerant

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